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[35.190.215.205]) by smtp.gmail.com with ESMTPSA id o1sm4589796wrw.20.2020.06.18.10.52.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Jun 2020 10:52:19 -0700 (PDT) Date: Thu, 18 Jun 2020 17:52:18 +0000 From: Tomasz Figa To: Yunfei Dong Cc: Hans Verkuil , Tiffany Lin , Rob Herring , Mauro Carvalho Chehab , Mark Rutland , Matthias Brugger , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: Re: [PATCH 1/2] media: v4l UAPI: add V4L2_BUF_CAP_SUPPORTS_RO_REQUESTS Message-ID: <20200618175218.GB10831@chromium.org> References: <20200617014928.4374-1-yunfei.dong@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200617014928.4374-1-yunfei.dong@mediatek.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Yunfei, On Wed, Jun 17, 2020 at 09:49:27AM +0800, Yunfei Dong wrote: > This patch adds support for the V4L2_BUF_CAP_SUPPORTS_RO_REQUESTS > flag. This flag is used for RO Request. I think this patch series lacks two major things: - a cover letter explaining the feature and what it is needed/useful for, - a user - is there an upstream driver which would implement this feature and benefit from it? Best regards, Tomasz